hey now,when a concern of road noise comes up, the thing to remember is the tires are the source.
have not worked for tire shops in a while, but pirele(spelling?) tire are quiet. because they are soft, they also wear fast. road noise is related to tread design. ask anyone with off road tires.
hd shocks and soft tires work well together.
most name brand tires are quiet. dunlop seem to ride hard,so putting them with hd shocks and the bumps are felt more.
good luck
rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car